{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:7NVZHML2MCXXQLJAAPIAFPP7JZ","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"6148e22d1f6f20e2959a17afd5bb60a9e0f074d95e86712d669a676fbfb66da5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2016-10-05T19:59:13Z","title_canon_sha256":"11182272feca152941414f4b9d0ecb118138cea24195fe2731fb908b8a354d7f"},"schema_version":"1.0","source":{"id":"1610.01589","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.01589","created_at":"2026-05-18T01:03:06Z"},{"alias_kind":"arxiv_version","alias_value":"1610.01589v1","created_at":"2026-05-18T01:03:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.01589","created_at":"2026-05-18T01:03:06Z"},{"alias_kind":"pith_short_12","alias_value":"7NVZHML2MCXX","created_at":"2026-05-18T12:30:04Z"},{"alias_kind":"pith_short_16","alias_value":"7NVZHML2MCXXQLJA","created_at":"2026-05-18T12:30:04Z"},{"alias_kind":"pith_short_8","alias_value":"7NVZHML2","created_at":"2026-05-18T12:30:04Z"}],"graph_snapshots":[{"event_id":"sha256:8719095131c89bd1e4558b83041a39eefe2e4759be563a400b6d42f66eab487f","target":"graph","created_at":"2026-05-18T01:03:06Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We propose here the use of the variational level set methodology to capture Lagrangian vortex boundaries in 2D unsteady velocity fields. This method reformulates earlier approaches that seek material vortex boundaries as extremum solutions of variational problems. We demonstrate the performance of this technique for two different variational formulations built upon different notions of coherence. The first formulation uses an energy functional that penalizes the deviation of a closed material line from piecewise uniform stretching [Haller and Beron-Vera, J. Fluid Mech. 731, R4 (2013)]. The sec","authors_text":"Alireza Hadjighasem, George Haller","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2016-10-05T19:59:13Z","title":"Level set formulation of two-dimensional Lagrangian vortex detection methods"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.01589","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:479b583110a4146829a4e345a63be2b12fb3e3d05fece1d6adb318d1fab83d34","target":"record","created_at":"2026-05-18T01:03:06Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"6148e22d1f6f20e2959a17afd5bb60a9e0f074d95e86712d669a676fbfb66da5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2016-10-05T19:59:13Z","title_canon_sha256":"11182272feca152941414f4b9d0ecb118138cea24195fe2731fb908b8a354d7f"},"schema_version":"1.0","source":{"id":"1610.01589","kind":"arxiv","version":1}},"canonical_sha256":"fb6b93b17a60af782d2003d002bdff4e4d25c6579f37d5838c8708979a169c61","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fb6b93b17a60af782d2003d002bdff4e4d25c6579f37d5838c8708979a169c61","first_computed_at":"2026-05-18T01:03:06.809406Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:03:06.809406Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CN0B7p/sr5yJkua2ekoXuoU+bXfVJ0Ip+adGv0xuocNg7YenfoXwWJQd9yF0/mRe1fmHl8CnStNflBKLyRhMBg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:03:06.809984Z","signed_message":"canonical_sha256_bytes"},"source_id":"1610.01589","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:479b583110a4146829a4e345a63be2b12fb3e3d05fece1d6adb318d1fab83d34","sha256:8719095131c89bd1e4558b83041a39eefe2e4759be563a400b6d42f66eab487f"],"state_sha256":"c28318df8fad292359b001bbae643b7d1101baa8f934a33d7b1af1b60024f59e"}